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"Matter has positive gravitational and inertial mass, that is, two objects attract each other, the lower mass faster than the more massive" A part of the law of gravity Newton. But how this applies to negative and imaginary masses? A hypothetical negative mass is a object that has negative gravitational and inertial mass, and therefore negative energy. A negative mass does not act as you think now. Obviously cause a repulsion towards the positive mass by the gravity, but have negative inertia, therefore the negative mass would not repelled by the positive mass, generating a "persecution" of negative mass after positive, that is, an acceleration of the set of masses of zero energy. Also, the negative mass repel itself, and thus a hypothetical negative solid mass tend to expand and disintegrate. On the other hand, an imaginary mass is a hypothetical mass that move at speeds greater than the speed of light and have positive energy, this is result of a squared negative mass, ie, imaginary-valued mass. How moves this? A real mass (either positive or negative), has a idle speed of 0m/s, the speed must always be less than the speed of light (c), and travels relatively to the future. A zero mass does not has repose velocity, always travels at light speed, and standing frozen (relatively) in time An imaginary mass has a idle speed of infinite speed, speed must always be major than the speed of light (more slower more energy required to slow, the reverse of real mass), and travels relatively to past. But how the imaginary mass interacts with itself, positive and negative real mass? I created this topic to disclose such hypothetical curiosities and find some conclusion, share information and delight in the truth.